Molofsky J, Durrett R, Dushoff J, Griffeath D, Levin S
Department of Botany, University of Vermont, Burlington, Vermont 05405, USA.
Theor Popul Biol. 1999 Jun;55(3):270-82. doi: 10.1006/tpbi.1998.1404.
In sessile organisms such as plants, interactions occur locally so that important ecological aspects like frequency dependence are manifest within local neighborhoods. Using probabilistic cellular automata models, we investigated how local frequency-dependent competition influenced whether two species could coexist. Individuals of the two species were randomly placed on a grid and allowed to interact according to local frequency-dependent rules. For four different frequency-dependent scenarios, the results indicated that over a broad parameter range the two species could coexist. Comparisons between explicit spatial simulations and the mean-field approximation indicate that coexistence occurs over a broader region in the explicit spatial simulation.
在诸如植物等固着生物中，相互作用在局部发生，因此诸如频率依赖性等重要的生态方面在局部邻域内得以体现。我们使用概率细胞自动机模型，研究了局部频率依赖性竞争如何影响两个物种能否共存。将这两个物种的个体随机放置在一个网格上，并让它们根据局部频率依赖性规则进行相互作用。对于四种不同的频率依赖性情形，结果表明在广泛的参数范围内这两个物种能够共存。显式空间模拟与平均场近似之间的比较表明，在显式空间模拟中，共存发生在更广泛的区域。
